Improvement in rotating harrows



J. B. GLASCOCK.

Revolving Harrow.

No. 17,831. Patented July 21," 1857 1mm W H UNITED STATES I PATENT OFFICE.

JAMES B. GLASOOGK, OF FANCY GREEK, ILLINOIS.

IMPROVEMENT IN ROTATING HARROWS.

To all whom it may concern.-

Be it known that I, JAMES B. GLASOOOK, o Fancy Creek, in the county of Sangamon and State of Illinois, have invented a new and useful Improvement in Rotating Harrows and I do hereby declare that the following is a full and exact description thereof, reference being bad to the accompanying drawings, making a part of this specification- Figure 1 being a top view of myaimproved barrow, and Fig.2 a side elevation of thesame.

Similar letters indicate the same parts in each drawing. I

The annular tooth-frame A may be made of. any suitable material and in any proper manner. The teeth f may be so secured in said frame as to descend vertically, or they may incline to any desired degree. Transverse spoke-bars D, which are halved together at their centers, are framed into the inner periphery ot' the tooth frame, or are otherwise securely combined with said tooth frame. A strong fulcrum-journal, 6, passes through the connecting-joint of the transverse bars D, precisely in the center of the tooth-frame, and is firmly secured in said position. The thick washer h, which embraces the fulcrum-journal e and rests upon the connecting-joint of the spoke-bars D, supports the weight ofthe draft bar B. An upper washer, g, on the said lnlcrum -jonrnal, and the pin 1 passing through the same, prevent the draft-bar from being drawn from its position during the forward movement of the harrow; or the same effect may be produced by any other suitable device. The after end of the draft-bar B extends rearward to or a little beyond the outer periphery of the tooth-frame A, and the spindle of an anti-friction roller, j, is secured in proper bearings to the rear portion of said drat't-banin such a position thatthe peripheryot' said roller will bear upon the upper surface of said toothframe. 7

My invention consists in causing the after endof the draft-bar B to bear upon the upper surface of the rotating tooth-frame A, and this invention has been the resultot' apraetical necessity which has been revealed to me by experiments with afull-sized harrow. With this description of harrow the power must be applied to the fulcrum-journal e, and this point being so far back of the front operating-teeth of the harrow, it will readily be perceived that there must be a constant tendency to throw upward the rear side of the rotating toothframe, and to correspondingly depress the front side of said frame, thereby causing an unsteady halting movement of theharrow, which produces a very severe strain upon the fulcrumjournal and the barrow-teeth, as well as upon every other portion of the harrow.

With a full-sized barrow I have found itimpossible to make the fulcrum -journal stifl enough to withstand this severe strain upon it; but by extending the draft-bar to the rear and causing its after end to bear upon the upper surface of the rear side of the rotating tooth-frame the fulcrum-journal is relieved from its excessive strain, and the barrow rotates steadily and evenly and with much less strain upon every part of the harrow, while 'at the same time the efliciency of its harrowing action is greatly increased.

I am aware that a patent has been granted for combining a weighted lateral arm with the draft-bar of a rotating harrow for the purpose of causing the harrow to have a positive rotary movement when it is drawn forward, and therefore I wish to be understood that- \Vhat I claim as my invention, and desire to secure by Letters Patent, is

Causing the after end of the pivoted draftbar to bear upon the upper surface of the rotating tooth-frame in such a manner as to properly distribute the propelling power exerted upon said draft-bar, by which I relieve the fulcrum-journal from injurious warping strains, and at the same time impart a steady and uniform movement to said tooth -frame as it is drawn forward, substantially as herein set forth.

The above specification of my new and useful improvement in rotating barrows signed and witnessed this 15th day of June, 1857.

JAMES B. GLASUOG'K.

Witnesses:

GEORGE W. ADAMS, Z. O. ROBBINS. 

